From Wikipedia

The Civil War
Episode Four

Simply Murder

The American Civil War was the deadliest war in American history, causing 620,000 soldier deaths and an undetermined number of civilian casualties. Its legacy includes ending slavery in the United States, restoring the Union, and strengthening the role of the federal government. The social, political, economic and racial issues of the war decisively shaped the reconstruction era that lasted to 1877, and brought changes that helped make the country a united superpower.

• PBS: The Civil War